Eddie Haskell was the bad kid who never went away. When child actor Ken Osmond stepped onto the set of Leave it to Beaver in 1957, he not only entered our living rooms, he homesteaded a permanent place in the American pop culture. The poster child for sneaky, rotten kids everywhere, he was the reference point for cautious mothers to warn their children about. And everyone in America knew an Eddie Haskell at some point in his or her lives. The amazing phenomenon of Ken Osmond's character is still going strong, over half a century after the show's cancellation. Even today, the name Eddie...